Person: SEVEN ERDEMİR, ÜMRAN
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SEVEN ERDEMİR
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ÜMRAN
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Publication Lead fractionation analysis in lipstick samples by inductively coupled plasma-mass spectrometry(Taylor & Francis, 2015-01-01) Yılmazcan, Özlem; Erdemir, Ümran Seven; İzgi, Belgin; Özer, Elif Tümay; Güçer, Şeref; Yılmazcan, Özlem; SEVEN ERDEMİR, ÜMRAN; İZGİ, BELGİN; TÜMAY ÖZER, ELİF; Güçer, Şeref; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Kimya Bölümü.; 0000-0003-3243-9168; 0000-0003-0610-2019; 0000-0002-1074-3612; AAE-8564-2020; AAI-3137-2021; Q-5688-2017; JKC-4986-2023; GAV-3362-2022A new analytical approach based on fractionation was introduced for lead in lipstick samples. Different separation techniques including n-hexane, glycerol extraction, and activated carbon adsorption were used to characterize the lipid fraction, polar and aromatic components of the samples. Additionally, artificial saliva and food stimulant extractions were used for the risk assessment studies. Trace metal levels in fractions were determined by inductively coupled plasma-mass spectrometry. Method validation parameters in the total element determinations were defined in terms of detection limits, accuracy, and precision. The limits of detection and quantification were 0.02 and 0.07mgkg(-1) for Pb; whereas the repeatability and reproducibility of the results based on percent relative standard deviation were 3.0% and 7.2% for lead, respectively.Publication Ni-induced changes in nitrate assimilation and antioxidant metabolism of verbascum olympicum Boiss.: Could the plant be useful for phytoremediation or/and restoration purposes?(Taylor & Francis, 2015-01-01) Akpınar, Ayşegül; Arslan, Hülya; Güleryüz, Gürcan; Kırmızı, Serap; Erdemir, Ümran Seven; Güçer, Şeref; AKPINAR, AYŞEGÜL; ARSLAN, HÜLYA; GÜLERYÜZ, GÜRCAN; KIRMIZI, SERAP; SEVEN ERDEMİR, ÜMRAN; Güçer, Şeref; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Biyoloji Bölümü.; Uludağ Üniversitesi/Gemlik Asım Kocabıyık Meslek Yüksekokulu.; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Kimya Bölümü.; 0000-0001-5441-037X; 0000-0003-3243-9168; 0000-0003-0610-2019; 0000-0002-2680-9815; 0000-0002-4606-0645; AAQ-8139-2021; D-2584-2016; A-5538-2019; HJY-1959-2023; Q-5688-2017; IVM-2806-2023; GAV-3362-2022Verbascum olympicum Boiss. (Scrophulariaceae) were studied as a candidate plant for remediating the Ni polluted soils. The metabolic responses, such as nitrate assimilation (nitrate reductase and glutamine synthetase activity) and antioxidant system activity [superoxide dismutase (SOD), catalase (CAT) and ascorbate peroxidase (APX) activity], of this species exposed to nickel in Hoagland's nutrient medium were investigated as remediation performance parameters. The accumulation of nickel and the variations in the content of some elements (B, Cu, Fe, Mg, Mn, Mo and Zn) and some growth parameters, such as the water content, biomass production, and contents of chlorophyll and soluble protein, were also examined. The accumulation of Ni in both the roots and leaves varied depending on the exposure times and doses. Increased oxidative stress was suggested by the increases in the activities of SOD, CAT and APX. Although some element contents were inhibited by Ni treatments, these inhibitory effects was decreased depending on the time, and even these elements are accumulated in roots. These results are the novelties in the use of this species in biotechnology.Publication Fractionation and bioaccessibility of manganese, copper, zinc, cadmium, and lead in commercial vegetable and rice baby foods using inductively coupled plasma-mass spectrometry (ICP-MS) with central composite design (CCD)(Taylor & Francis Inc, 2019-07-04) Erdemir, Ümran Seven; Şahan, Yasemin; Güçer, Şeref; SEVEN ERDEMİR, ÜMRAN; ŞAHAN, YASEMİN; Güçer, Şeref; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Kimya Bölümü.; Bursa Uludağ Üniversitesi/Ziraat Fakültesi/Gıda Mühendisliği Bölümü.; 0000-0003-3243-9168; Q-5688-2017; ABE-6748-2020; EZG-4843-2022Herein the bioaccessibility of Mn, Cu, Zn, Cd, and Pb, selected from essential and toxic elements, was determined in commercially sold vegetable purees intended for infant and toddler consumption. Chemical fractionation studies using water, acetone, diethyl ether, chloroform:methanol, and n-hexane were employed to predict the importance of the protein and lipid parts of a matrix to assess the bioaccessibility data. In addition, in-vitro gastrointestinal digestion was performed to determine the bioaccessibility of the elements using a five level, three factor central composite design (CCD) to maximize the elemental solubility. The total elemental concentrations in all of the fractions were determined by inductively coupled plasma - mass spectrometry (ICP-MS). Based on the consumption of one jar of vegetable/rice-based baby food, Zn was 1.3% of the recommended dietary allowance and Mn was 4.2% of the adequate intake level, while Cu was almost 100% of the adequate intake level. Additionally, Pb was always below the detection limit and Cd was sometimes under the detection limit for the percent bioaccessibility. However, in some samples, Cd was as high as 80% of the tolerable weekly intake level depending on the body weight.